feat(m3u): extract ClearKey DRM from #KODIPROP playlist lines

Adds the typed ChannelDrm model (shared interfaces) and a KODIPROP
post-processing step in createPlaylistObject() — the single funnel for all
four playlist import paths. Parses inputstream.adaptive.license_type,
license_key and drm_legacy; ClearKey keys accepted as kid:key hex pairs,
W3C ClearKey license JSON, or a plain kid→key JSON map. Unsupported license
types (Widevine/PlayReady/license URLs) are preserved with supported=false
so playback can surface a DRM diagnostic instead of failing silently.
Also adds isDashStreamUrl/isDashChannel helpers for DASH routing.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

libs/shared/interfaces/src/index.ts

@@ -1,3 +1,4 @@
+export * from './lib/channel-drm.interface';
 export * from './lib/channel.interface';
 export * from './lib/channel.model';
 export * from './lib/dev-logger.util';

libs/shared/interfaces/src/lib/channel-drm.interface.ts

@@ -0,0 +1,18 @@
+/**
+ * DRM configuration extracted from `#KODIPROP:inputstream.adaptive.*` lines of
+ * an M3U playlist entry. Only ClearKey is playable in-app; other license types
+ * are preserved so playback can surface a meaningful DRM diagnostic instead of
+ * failing silently.
+ */
+export interface ChannelDrmClearKeys {
+    /** Key id (32 lowercase hex chars) mapped to its key (32 lowercase hex chars). */
+    [kidHex: string]: string;
+}
+
+export interface ChannelDrm {
+    /** Normalized license type, e.g. `clearkey` or `com.widevine.alpha`. */
+    licenseType: string;
+    /** True only for ClearKey entries with at least one successfully parsed key. */
+    supported: boolean;
+    clearKeys?: ChannelDrmClearKeys;
+}

libs/shared/interfaces/src/lib/channel.interface.ts

@@ -1,3 +1,5 @@
+import { ChannelDrm } from './channel-drm.interface';
+
 /**
  * Represents channel object
  * TODO: define channel interface in iptv-parser library
@@ -29,4 +31,5 @@ export interface Channel {
         origin: string;
     };
     radio: string;
+    drm?: ChannelDrm;
 }

libs/shared/interfaces/src/lib/parsed-playlist.interface.ts

@@ -1,3 +1,5 @@
+import { ChannelDrm } from './channel-drm.interface';
+
 export interface ParsedPlaylist {
     header: {
         attrs: Record<string, string | undefined>;
@@ -31,4 +33,5 @@ export interface ParsedPlaylistItem {
     };
     timeshift?: string;
     radio?: string;
+    drm?: ChannelDrm;
 }

libs/shared/interfaces/src/lib/portal-playback.interface.ts

@@ -1,3 +1,4 @@
+import { ChannelDrm } from './channel-drm.interface';
 import { PlaybackPositionData } from './playback-position.interface';
 
 export interface PlayerContentInfo extends Omit<
@@ -18,4 +19,5 @@ export interface ResolvedPortalPlayback {
     userAgent?: string;
     referer?: string;
     origin?: string;
+    drm?: ChannelDrm;
 }